User's Manual

THE 80286 INSTRUCTION SET
XOR-Logical Exclusive OR
Opcode
Instruction Clocks
30
Ir
XOR eb,rb
2,mem=7
31
Ir
XOR eW,rw 2,mem=7
32
Ir
XOR rb,eb 2,mem=7
33
Ir
XOR rw,ew
2,mem=7
34 db
XOR AL,db
3
35
dw XOR AX,dw
3
80
16
db
XOR eb,db 3,mem=7
81
16
dw XOR eW,dw
3,mem=7
FLAGS MODIFIED
Overflow =0, sign, zero, parity, carry=O
FLAGS UNDEFINED
Auxiliary carry
OPERATION
Description
Exclusive-OR byte register into EA byte
Exclusive-OR word register into EA word
Exclusive-OR EA byte into byte register
Exclusive-OR EA word into word register
Exclusive-OR immediate byte into AL
Exclusive-OR immediate word into AX
Exclusive-OR immediate byte into EA byte
Exclusive-OR immediate word into EA word
XOR computes the exclusive OR of the two operands. Each bit of the result is 1 if the corresponding
bits of the operands are different; each bit
is 0 if the corresponding bits are the same. The answer
replaces the first operand.
PROTECTED MODE EXCEPTIONS
#GP(O) if the result is in a non-writable segment. #GP(O) for an illegal memory operand effective
address
in the es, DS, or ES segments; #SS(O) for an illegal address in the SS segment.
REAL ADDRESS MODE EXCEPTIONS
Interrupt 13 for a word operand at offset OFFFFH.
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